#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
	int a, b;
	unsigned c, d;
	a = 100;
	b = -100;
	c = a;
	d = b;
	printf("a=%d,b=%d\n", a, b);
	printf("a=%u,b=%u\n", a, b);
	printf("c=%u,d=%u\n", c, d);
	return 0;

}